Zero Casimir Force in Axion Electrodynamics and the Search for a New Force

Understand

We point out that there is a stable configuration of metal plates where the Casimir force is vanishing in axion electrodynamics.

• We consider a concrete setup involving Weyl semimetals, which hosts an axion-like effect on the electromagnetism, towards the measurement of the axionic effect on the Casimir force.
• Our setup realizes zero Casimir force between metals and may be useful for the search for new force mediated by light particles at the micrometer scale.